兼容Chrome 41.0+、IE8+、360 7.0+(极速模式)
1.方管W=(OC-4WT)*WT*0.00785 =(2a+2b-4wt)*wt*0.00785=(2*45+2*75-4*1) *1*0.00785 =
liu19820314
2208
无缺
1592
dzp0304
1577
llx364300
1570
龙哥
1473
chenxi807
1193